diff -r 99fad54de9f7 -r 99b6bab765f8 WMI/Hardware.cs
--- a/WMI/Hardware.cs	Mon Oct 18 07:15:31 2010 +0000
+++ b/WMI/Hardware.cs	Mon Oct 18 07:18:14 2010 +0000
@@ -54,7 +54,9 @@
       Name = hardware.Name;
       Identifier = hardware.Identifier.ToString();
       HardwareType = hardware.HardwareType.ToString();
-      Parent = hardware.Parent.Identifier.ToString();
+      Parent = (hardware.Parent != null)
+        ? hardware.Parent.Identifier.ToString()
+        : "";
     }
 
     public void Update() { }